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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f3768bf4337b477b9c6d0e40453396ecccadaabe59fe712017350302ac5965' 
  AND token = 'Crb2/CAaWr9Myfv04+kN44qJcBnZK4YH3an7oqIHmgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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