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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1731ab7e3969136de90638b3ac7e34fa4f59a458ee1997bb49feb85d95f8c8f3' 
  AND token = 'lEGfQa8SJj0WL3Rtj+4kquxR7m1PzCymuzr6FwUIWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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