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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd196b185d8eef58737b388f0d69ac0a708c0afb2bb51f5aa975f2e7c9ce3fae3' 
  AND token = 'sEDyklIRRfJCBws8zKs+LiSpcTA9+IsrSkVTc2eGgOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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