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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae04facf2e82df54e57a6aaff73e53fefeec2dfe7ba309f95cb0c1f0e38b3915' 
  AND token = 'H2nUpUqbZkshmCzu/b9VXRqYaw5IfnJnWkinSut6KGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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