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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d48c2b92e9beb5174b950cc4607cfb739e94f0eb994265d22e8ae752649ccf' 
  AND token = 'i8OmMcBJV9p9aAbUH0KjtKBgFfaN2DelW9ANFJ123fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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