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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e72c2d751be34a0f744dedd86a33e610387e8b5480b5eb030ac259553356046' 
  AND token = '7Nn2mPyaTYX+UZuujdhzde6AcfVTIVO6onjBGZ1x7HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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