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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0353e21b55284ac118a5d0bc81a36d680a64053f5971b9f01c2824e22ba0fce3' 
  AND token = 'v0FZDSvVHNebPRgc17t5wEtPJa/B1mbE77NC1KFKH/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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