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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1432f52ca68ba6df199fe04fa72b410ccf06dc72ebc2b533b7ce9b6609ee3878' 
  AND token = 'fXJJlLtR1xxmblpEiG0xzlKnGqp6nUncZZGtE/Awh5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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