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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5528b49f6354ef785bd7e3874215b825442eae2000e681c6ba77ea7e85193055' 
  AND token = 'hSOq0IR67dCpXzxQ3NgiJCZ96Yns9gFtggHNorg7olA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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