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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639e00cbd5ed784266dac46a6810cadb337bd063394d6bcde56dbe144aa6bd36' 
  AND token = '7Z5LUt+1PNdfAPDFWkayWgRuysAsTZUiwgWu07X9+zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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