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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab7502c606c9ac874865a374b85e9afc00ea00353263a1a6d4c32270a82bb41' 
  AND token = 'VICEhxKDcnVXaNmlzLgyu8X8O4qXCTSnieci9Mba/T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}