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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d744807173209178e8f08613cd66d2f0a4af63a0ba3b7adec2f824513dfb92' 
  AND token = 't6zGChzd7fo4BRa8gpxM+AQsfw/lENIWdaoVH+89wJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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