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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c44cee3bb418f2302159d1add87827a6a6a5bf13578867a372bed7b6122eea' 
  AND token = 'fZzQKpS5Q88txjEUZnrCznc7gD7veIX2vprKnMthzko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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