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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0f2cef0587c387d4c637300f6a8e0d4ae9055f92362bf71a4a0b954593b934' 
  AND token = 'Rpwx0NsQ85zkDltOFWnNQcFR3CL11hYTbY6o+bpU8YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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