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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bcdafe1684af9d9acfc6735f66e8a3309acff0e29bc54e90a5ec693a2003bd' 
  AND token = 'GtmixYAL/yuATo9reahRWOTQG2tfAPj/I+SiyWIQXt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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