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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5e692de75b36b6781f442994bbe1cff279c9fcd57749ab844ad8d43b605ba7' 
  AND token = 'UzTe0da/MS59KcGLYSdx3iaKxZm+aCUcnF7G2UpzZxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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