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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd2b792a387e767a7f01b190f9c7f03ea870f5e5a5f9be87e5d06cf5d0e0f0b' 
  AND token = 'YSgY8I9RKWKS6Ln2XvPNNUjtS6XsUYOm+1Sm9HokxJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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