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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258e0f4b8ba8358d9dbf7db3ec2f3d84ddfc2b6675af99ddfb0b60d749d54fd9' 
  AND token = 'iLJu72eqFJnR0g16v2Yr6rau7r5gZSbbnVAXdC+X4a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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