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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ee429303e1f7dfaee6abcc630a98bf073545ee148fd2fb7d3a57b3ceda10b9' 
  AND token = '5f3BnxPpwLOZa+RUL8pxIA/fmYkJuVLI4et1zh1Jt0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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