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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf461766b35b6e0f82769cc23c00e8d4537605609630ef229b07405a170ef9f4' 
  AND token = 'b61/BT4rapF7cTUxCcu5fvCnIozdicejBHp51oOBhNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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