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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1ae5f384c17a7cd0d8da3f2b377142249d1b2ffe47085321c07df8ac34dca0' 
  AND token = 'X9sq/CrUY6SWp9SVfQDPtPPF2EP0Kqdn7D6C3UYASCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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