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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92f7ff1bb7e7b355078fdb72174f1e263d8a038809ef629b951d0d17ffb46ae' 
  AND token = 'PPo8vm9YwVgHoXqDx8719ZALAxh1D5d31eCnbu3y7+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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