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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4865ab4ffb7be137f4b661388331772fb3189bfd86abe642338430ad75d400cd' 
  AND token = 'HwQlV84QcMq07uiD46y7wLG48qdR+O1m5pXqwGj8Iog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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