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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e7d2e39ece565b8bc14e817b9e606a07853bc9c8de06bc33c8ce18e27ae639' 
  AND token = 'O3bIcQ1/oWzT1mpV5Dw3m8IfVxkEgSkjRMiLNF0lyQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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