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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dc88d06f533853f8e084b2e967cdfd54c7724416847fffe3af2bb100dcadf5' 
  AND token = '8BzE5FYD2K4oe7qUU2r9Cope9lLUL3vx4QfLQnqQ7bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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