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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e190eedf3668bcd697a832b7c293a7d28f099bc60ab05868c0d9cb1b243dda4' 
  AND token = 'AcjhUZFq3ARBFocnqdx6U9skc/Ph3+IJpkoYwh6YAHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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