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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a32cbc23544e677a3861e4d8f713e71f8b97752af6e7f0225099c7f4b38ed9' 
  AND token = '0klgfks6NNCPnPzk8DdBZ3OqQVAumhTB6D6MwM1X/Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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