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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0af4c03004e294d9f5c80de42a3a0d9f45189a51bfd424196462301e4d296b4' 
  AND token = 'HdIJQPUjmvCDQGnCJGHoMwKYGwRjShVn2dzAysEajjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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