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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f07151083fed21484240cee9b62dfd5119c3503f4ac55e55a26b12699b802b4' 
  AND token = 'qrSIDY8ljb8zlHnyZT82Zizj7T1HXTNTitguAdoNjrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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