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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef51e6c34c1f01b074f0dff68dc10c1660a9e45f8c04bd44c57223436cd1e509' 
  AND token = 'Isy9RGelDG4LY9M5IjDhVm59zulB6/hWDw8OCJno+QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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