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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423baab3e379fa2dfc722e908e4e4323e0ffc61482622d1b9a7e20595a2538fa' 
  AND token = 'g9v/hs4jX+y89ZNyZK4BALryKzkLXX6l7E+PTu4w5ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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