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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd98703b37a55dc309cdc1392f5a3f7fce8dacdbf1fe804b8426d21c835cac0e' 
  AND token = 'm4v5lxV/TcFOjSRLFiA1euTuAUuY61uTZ74Ak32aaFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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