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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f920a3c223e1b75edac75ca2c13026e5904b029e92a7a3d2f9b19549150e56dd' 
  AND token = 'tS3qaIdZWAGaZ8n3/bsxav8k26xJG34xRq+TOAuZdgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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