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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1df5a95e9726dc93423d632269279ea4088f2a139f0355cc83395bdfe780e1' 
  AND token = 'm5E/4I1YmewqlE+y6Z0Q6tqz2X5T2Id3fzjyeWHQr/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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