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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb5487138e4a8e79840cb7992b9117bea70f13d4b9be77e56b802e8698ad266' 
  AND token = 'A1bOE+pXDlbZhjZO/ouTY80Lc3YIR7LLKNdJb3yAWRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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