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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd27c0546362a8aff67338c0d42b0f14e2c3470119bd31c31886607b6a2accc6' 
  AND token = 'DgrooJdUm22vAi80MMxGpaS3qwCbvg7MEFmZdUZjdJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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