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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99948220d83c52eea8a4214e2c4a0bbeb8763b6e730edf95b1c306d6e8f01ece' 
  AND token = 'nwIcquzE9xCSf3amfuBdN06WawfyJgBB4PTQELuDe0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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