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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0a6894d17e5a9bc67e9f0c201f405f58b1dfacc815d9fe4408f8b5d1f2181f' 
  AND token = 'i7DAtcrq8Ll2Q58kg8yPewFMUZhu4108MEeriO9O1nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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