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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f23bb8672f1c1413f5c93b8bb2b88bcb910143e2f9d2f1bb93172886d43e98' 
  AND token = '8Zdk6+NtbZE9flkLS0wjCw1kPdV+35XL4fiGpoZQ3fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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