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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d85b42a364dfe6e35463c9a8680e2e9e5aba444527fc36b4c35d6c11f5c8202' 
  AND token = 'pvcDESN18WhL00xPcWYAE7fhTIgY+C23ofCVLJwhuSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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