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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9007e8c44dfa200068ce8e5bf143f16b499a8479c2c95b82c70e00bab4488cc5' 
  AND token = '5jK3MtT1cGJZze6hDrJ/kzAUym/bK65TtLOebljfI0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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