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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f8b0e6583ccbeeb36e14c690a81a42a82795e2a0f9cab6a442d1c915e925de' 
  AND token = 'bt9X3A6zeoUmMooIK0RXTV28CzQN6VvbXVRzPOm8wWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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