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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a13d60fd6fdc03c2f4cf73dbbfa95e779e96e301eadc61cd4b8f366cf7fc524' 
  AND token = 'zYaUSH2YLVy2rPD6Fyo3cSAfH7iEKcDpf718sYSfZ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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