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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3acf370c4c86d23ad68b4535b2aa42e42c942e31fe8c3384d495eb4ff7348be' 
  AND token = 'kiU74XCp+Vl/ZQ2WxCYRjdGHW4cSMMTmF61bJdUfsoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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