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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d3fa9f47ed98148a72512532098d56eff7c412d6f14a95a6aa5a8455b0d801' 
  AND token = '97Mw53S58R4aShYy4BGVAAZVO3fG0K++zwrFbe45s8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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