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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b462f4bb7454e02d45b5ff1589bbcfb45015eee210924a84daecb0004ff31f' 
  AND token = 'wx0In+WPDsDHkxJTol9fO+OFHfvcsl6pk3+1HpMn2VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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