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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e51bc3a61973566d9d5de0b370c01a0ba03bfc35f71eda5a598e6e5dc1b034' 
  AND token = 'OM9ADADScQFPjOv7aNncL+h2ajLX2seh9t13o/ZqV9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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