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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0e0a3f4c01691fb271e994682f5af303dbcd6342d491e7b45c715655a3dd81' 
  AND token = 'zBsALTJM+udDF19lRCT9V+Inrl3ktUcIpU48ILaMwZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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