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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a3e2482cecde303e8ca72cf80346167b6b5e5cab02e44190a8013ea7bbd734' 
  AND token = 'jj52sec4gyyJr8/kBsA4kipW2zWLw7FNVjT2H7dynXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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